Studies on the sterility in barley. : I. On the mechanism in occurrence of sterile grains.

[摘要] 1. Using the two-rowed spring variety "Moravia", the mechanism of sterility occurring every year with relatively high percentage in spring sown barley in Hokkaido was studied with special reference to the abnormalities of pollen, anther dehiscence, pollen shedding, elongation of pollen tube, and ovule. Then the percentage of sterility was classified according to the above mentioned causes. 2. The greatest cause in the sterility was non-pollination due to the abnormalities of anther dehiscence and pollen shedding by its wettish condition at the dehiscing time, and this cause took place about 60% in the total percentage of sterility. 3. The sterility due to the abnormalities of pollen and pollen tube (the latter involves the following phenomena: 1. upward, not downward, elongation in stigma, 2. abnormal swelling in the tip of pollen tube in stigma.) took place respectively 1O% and 1% and the non-germination of pollen on the stigma did about 20% in the total percentage of sterility. 4. Female sterility due to the abnormality of embryo was only 10%. Accordingly the sterility in barley belongs to the male sterile (cf. Table 9).

[学科分类] 农业科学（综合）